Class VII

Ocean water can be made fit for drinking by using
  1. osmosis
  2. reverse osmosis
  3. aeration
  4. filteration
Which of the following is not a water-borne disease?
  1. Cholera
  2. Meningitis
  3. Hepatitis
  4. Measles
Open drains is a breeding place for
  1. mosquitoes
  2. flies
  3. disease causing organisms
  4. all of these
Fruits and vegetable waste present in sewage are
  1. organic impurities
  2. inorganic impurities
  3. nutrients
  4. bacteria
The process of waste treatment is called
  1. Water treatment
  2. Pollutant separation
  3. Chlorination
  4. Sewage treatment
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